hi i have recently been going through sti screening in th last 6 months i have tested negative to everything including herpes via bloodtest, but i have recently had an ultrasound and my doc says i have a 4mm blister on my prostate could this be herpes i have not told my doc but I have had a lot of anal rimming in the past, I have discussed this with my local STI clinic though. I had a lump which looked like an hemmeroid which a doc and STI Clinic said was a hemmeroid by looking at it. But the blister on my prostate has me worried it might be herpes caused from rimming and protected anal sex. Am i at risk here some people say blood tests are not accurate for herpes. Please can someone help